<template>
    <input type="text" v-model="val">
    <button @click="handleAdd">点击</button>
</template>
<script setup>
    import { ref,defineEmits } from 'vue';

    //声明自定义事件 完成子传父

    let val = ref("")

    let emit = defineEmits(['add'])

    let handleAdd = ()=>{
        emit('add',val.value)
    }
</script>